That lovely white BMW outfit with the chair on UK left is the only one i've seen at the TT and I think is/was owned by a regular TT customer of my late Dad's butcher's shop which used to be in Dukes Rd Douglas, the owner Graham used to get his daily provisions from Dad up until 93/94 and that outfit is unforgettable and i'm sure i've seen it up until at least the Centenary year with Graham aboard it ... Graham was a very handy bloke in 1993 when I threw my TZ down the road at Bungalow early morning practice - turned out he was a time served old fashioned panel/metal beater and spent a day and a half beating with borrowed dolly weights and hammers my tank into a condition where it at least sat ok on the frame and got us back out for practice after it had crunched top side first into the raised tram tracks at the side of the course.... that RG500 is indeed proper bonkers.